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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package pool | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| var ( | ||
| ErrPoolTernimated = errors.New("pool is ternimated") | ||
| ErrTimeout = errors.New("timeout") | ||
| ) | ||
|
|
||
| type Pool struct { | ||
| ctx context.Context | ||
| cancel context.CancelFunc | ||
|
|
||
| workers int | ||
|
|
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| tasks chan Task | ||
| wait sync.WaitGroup | ||
| } | ||
|
|
||
| func NewPool(size int, workers int) *Pool { | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| pool := &Pool{ | ||
| ctx: ctx, | ||
| cancel: cancel, | ||
| workers: workers, | ||
| tasks: make(chan Task, size), | ||
| } | ||
|
|
||
| pool.wait.Add(workers) | ||
|
|
||
| for i := 0; i < workers; i++ { | ||
| go pool.consume() | ||
| } | ||
|
|
||
| return pool | ||
| } | ||
|
|
||
| func (p *Pool) SubmitFn(timeout time.Duration, fn func()) error { | ||
| if fn == nil { | ||
| return errors.New("fn is nil") | ||
| } | ||
|
|
||
| taks := &task{ | ||
| fn: fn, | ||
| } | ||
| return p.Submit(timeout, taks) | ||
| } | ||
|
|
||
| func (p *Pool) Submit(timeout time.Duration, task Task) error { | ||
| if task == nil { | ||
| return errors.New("task is nil") | ||
| } | ||
|
|
||
| if p.ctx.Err() != nil { | ||
| return ErrPoolTernimated | ||
| } | ||
|
|
||
| select { | ||
| case p.tasks <- task: | ||
| return nil | ||
| case <-time.After(timeout): | ||
| return ErrTimeout | ||
| } | ||
| } | ||
|
|
||
| func (p *Pool) consume() { | ||
| defer p.wait.Done() | ||
| for { | ||
| select { | ||
| case <-p.ctx.Done(): | ||
| return | ||
| case t := <-p.tasks: | ||
| t.Execute() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (p *Pool) Shutdown() { | ||
| if err := p.ctx.Err(); err != nil { | ||
| return | ||
| } | ||
|
|
||
| p.cancel() | ||
| p.wait.Wait() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| package pool | ||
|
|
||
| import ( | ||
| "github.com/stretchr/testify/assert" | ||
| "sync" | ||
| "sync/atomic" | ||
| "testing" | ||
| "time" | ||
| ) | ||
|
|
||
| func TestError(t *testing.T) { | ||
| pool := NewPool(0, 1) | ||
|
|
||
| err := pool.SubmitFn(time.Second, nil) | ||
| assert.Equal(t, "fn is nil", err.Error()) | ||
|
|
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| err = pool.Submit(time.Second, nil) | ||
| assert.Equal(t, "task is nil", err.Error()) | ||
|
|
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| // panic should be recovered | ||
| err = pool.SubmitFn(time.Second, func() { | ||
| panic("foo") | ||
| }) | ||
| assert.NoError(t, err) | ||
|
|
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| pool.Shutdown() | ||
| pool.Shutdown() // no panic | ||
| } | ||
|
|
||
| func TestSubmit(t *testing.T) { | ||
| pool := NewPool(5, 1) | ||
| wait := sync.WaitGroup{} | ||
| for i := 0; i < 5; i++ { | ||
| wait.Add(1) | ||
| err := pool.SubmitFn(time.Second, func() { | ||
| wait.Done() | ||
| }) | ||
| assert.NoError(t, err) | ||
| } | ||
| wait.Wait() | ||
| } | ||
|
|
||
| func TestSubmitWithTimeout(t *testing.T) { | ||
| pool := NewPool(1, 1) | ||
| err := pool.SubmitFn(time.Second, func() { | ||
| time.Sleep(time.Second * 5) | ||
| }) | ||
| assert.NoError(t, err) | ||
| err = pool.SubmitFn(time.Second, func() { | ||
| time.Sleep(time.Second * 5) | ||
| }) | ||
| assert.NoError(t, err) | ||
| err = pool.SubmitFn(time.Second, func() {}) | ||
| assert.Equal(t, ErrTimeout, err) | ||
| } | ||
|
|
||
| func TestShutdown(t *testing.T) { | ||
| pool := NewPool(1, 1) | ||
| pool.Shutdown() | ||
| err := pool.SubmitFn(time.Second, func() {}) | ||
| assert.Equal(t, ErrPoolTernimated, err) | ||
| } | ||
|
|
||
| func TestGracefulShutdown(t *testing.T) { | ||
| var counter int64 | ||
| atomic.StoreInt64(&counter, 0) | ||
|
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| pool := NewPool(100, 100) | ||
|
|
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| for i := 0; i < 100; i++ { | ||
| err := pool.SubmitFn(time.Second, func() { | ||
| time.Sleep(time.Second) | ||
| atomic.AddInt64(&counter, 1) | ||
| }) | ||
| assert.NoError(t, err) | ||
| } | ||
|
|
||
| pool.Shutdown() | ||
| assert.EqualValues(t, 100, counter) // all submitted and scheduled tasks should be executed successfully | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| package pool | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "runtime" | ||
| ) | ||
|
|
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| type Task interface { | ||
| Execute() | ||
| } | ||
|
|
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| type task struct { | ||
| fn func() | ||
| } | ||
|
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| func (t *task) Execute() { | ||
| defer func() { | ||
| if e := recover(); e != nil { | ||
| buf := make([]byte, 2048) | ||
| n := runtime.Stack(buf, false) | ||
| buf = buf[:n] | ||
| fmt.Printf("panic recovered: %v\n %s\n", e, buf) | ||
| } | ||
| }() | ||
| t.fn() | ||
| } |
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